Am I crazy?

My husband and I have been together 6 years. I’ve always known he was adopted at 2 years old through the foster care system. About a year ago his parents gave him the papers with vague info on his bio mom, and a picture of them together. His bio mom was 15 years old when she had him and it says in the paper she wanted custody of him but was a foster kid herself and was unable to take care of him. It also says in the paper she wanted him back when she was able to meet all the requirements the county gave her. Obviously she was too young to meet those and the county put him up for adoption. I’ve never really given it much thought, until we had our baby girl 5 months ago. She looks so much like him and it just makes me sad for his bio mom, she didn’t choose to be in foster care herself, she did get pregnant but she was just a kid. Obviously we don’t know if she knows his name or any info or if she’s even alive or what happened to her. But it just makes me sad thinking how our system is, it is great he was adopted by good parents who were able to take care of him and give him a chase. I think I feel this way now because I’m a new mom and the thought of someone taking my baby is awful and I just can’t help but to think how she feels everyday. Am I just too nosey in this situation, I know it’s not my mom and it’s his but it just makes me sad for him even tho he has great parents anyways.